An Upper West Side woman says she’s suing the city because maintenance workers in Central Park ran over and killed her beloved poodle while she watched in horror.

Sallie Okamoto, once a top fashion designer who made dresses for Rosalynn Carter, said she hasn’t recovered from the death of Christopher, her 14-year- old pooch, on Dec. 10.

“It was unforgivable what they did,” she said yesterday. “They killed my Christopher right in front of me.”

Okamoto’s lawyer said his client has formally notified the city she will sue — but will drop the claim if the Parks Department apologizes and reimburses her for the cremation, the $5,000 she had just paid to remove the dog’s cataracts and a tumor from his leg, and the $3,000 she spent buying a new poodle.

“She really just wants to make sure this doesn’t happen again to anyone else,” said lawyer Carmen Giordano. “She doesn’t want to make a federal case about it.”